Explicação passo-a-passo:
[tex]a)4x + 2 = 38 \\ 4x = 38 - 2 \\ 4x = 36 \\ x = \frac{36}{4} [/tex]
[tex]x = 9[/tex]
[tex]b)54 = 6x + 12 \\ 54 - 12 = 6x \\ 42 = 6x[/tex]
[tex]x = \frac{42}{6} [/tex]
[tex]x = 7[/tex]
[tex]c)x - 1 = 11 \\ x = 11 + 1 \\ x = 12[/tex]
[tex]d)2x + 8 = 14 \\ 2x = 14 - 8 \\ 2x = 6 \\ x = \frac{6}{2} [/tex]
[tex]x = 3[/tex]
[tex]e) - 9 = 6 + 5x \\ - 9 - 6 = 5x \\ - 15 = 5x \\ x = \frac{ - 15}{5} [/tex]
[tex]x = - 3[/tex]
[tex]f)7 = - 14 - x \\ 7 + 14 = - x \\ 21 = - x \: \: \: \times ( - 1) \\ x = - 21[/tex]
[tex]g)5x + 5 = - 10 \\ 5x = - 10 - 5 \\ 5x = - 15 \\ x = \frac{ - 15}{5} [/tex]
[tex]h) - 3x + 15 = - 45 \\ - 3x = - 45 - 15 \\ - 3x = - 60 \: \: \times ( - 1) \\ 3x = 60 \\ x = \frac{60}{3} [/tex]
[tex]x = 20[/tex]
A)x=9
B)x=7
C)x=12
D)x=3
E)x=-3
F)x=-21
G)x=-3
H)x=20
Explicação passo a passo
A)4x+2=38
4x+2=38
4x+2-2=38-2
4x=38-2
4x=36
4x÷=36÷4
x=36÷4
4x÷4=36÷4
x=9
Resposta
B)54=6x+12
54=6x+12
54-6x=6x+12-6x
54-6x=12
54-6x-54=12-54
-6x=12-54
12-54
-(54-12)
-42
-6x=-42
-6x÷(-6)=-42÷(-6)
x=-42÷(-6)
x=42÷6
x=7
C)x-1=+11
x-1=+11
x-1+1=11+1
x=11+1
x=12
D)2x+8=14
2x+8=14
2x+8=14-8
2x=14-8
2x=6
2x÷2=6÷2
x=6÷2
x=3
E)-9=6+5x.
-9=6+5x
-9-5x=6+5x-5x
-9-5x=6
-9-5x+9=6+9
-5x=6+9
-5x=15
-5÷(-5)=15÷(-5)
x=15÷(-5)
-5x÷(-5)15÷(-5)
x=-15÷5
-5x÷(-5)=15÷(-5)
x=-3
F)+7=-14-x
7=-14-x
7+x=-14-x+x
7+x=-14
7+x-7=-14
7+x=-14-x
7+x-7=-14-7
x=--14-7
x=-14-7
-14-7
-(14+7)
-21
x=-21
x=21
G)5x+5=-10
5x+5=-10
5x+5-5=-10-5
5x=-10-5
-10-5
-(10+5)
-15
5x=-15
5x÷=-15÷5
5x÷5=-15÷5
H)-3x+15=-45
-3x+15=-45
-3x+15-15=-45-15
-3x=-45-15
-45-15
-(45+15)
-60
-3x=-60
3x÷(-3)=-60+(-3)
x=-60÷(-3)
-3x÷(-3)=-60÷(-3)
x=60÷3
x=20
Resposta da
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Explicação passo-a-passo:
[tex]a)4x + 2 = 38 \\ 4x = 38 - 2 \\ 4x = 36 \\ x = \frac{36}{4} [/tex]
[tex]x = 9[/tex]
[tex]b)54 = 6x + 12 \\ 54 - 12 = 6x \\ 42 = 6x[/tex]
[tex]x = \frac{42}{6} [/tex]
[tex]x = 7[/tex]
[tex]c)x - 1 = 11 \\ x = 11 + 1 \\ x = 12[/tex]
[tex]d)2x + 8 = 14 \\ 2x = 14 - 8 \\ 2x = 6 \\ x = \frac{6}{2} [/tex]
[tex]x = 3[/tex]
[tex]e) - 9 = 6 + 5x \\ - 9 - 6 = 5x \\ - 15 = 5x \\ x = \frac{ - 15}{5} [/tex]
[tex]x = - 3[/tex]
[tex]f)7 = - 14 - x \\ 7 + 14 = - x \\ 21 = - x \: \: \: \times ( - 1) \\ x = - 21[/tex]
[tex]g)5x + 5 = - 10 \\ 5x = - 10 - 5 \\ 5x = - 15 \\ x = \frac{ - 15}{5} [/tex]
[tex]x = - 3[/tex]
[tex]h) - 3x + 15 = - 45 \\ - 3x = - 45 - 15 \\ - 3x = - 60 \: \: \times ( - 1) \\ 3x = 60 \\ x = \frac{60}{3} [/tex]
[tex]x = 20[/tex]
A)x=9
B)x=7
C)x=12
D)x=3
E)x=-3
F)x=-21
G)x=-3
H)x=20
Explicação passo a passo
A)4x+2=38
4x+2=38
4x+2-2=38-2
4x=38-2
4x+2=38
4x=38-2
4x=36
4x÷=36÷4
x=36÷4
4x÷4=36÷4
x=9
4x=36
x=9
Resposta
x=9
B)54=6x+12
54=6x+12
54-6x=6x+12-6x
54-6x=12
54=6x+12
54-6x=12
54=6x+12
54-6x-54=12-54
-6x=12-54
54=6x+12
-6x=12-54
12-54
-(54-12)
-42
-6x=12-54
-6x=-42
-6x÷(-6)=-42÷(-6)
x=-42÷(-6)
-6x÷(-6)=-42÷(-6)
x=42÷6
-6x÷(-6)=-42÷(-6)
x=7
-6x=-42
x=7
Resposta
x=7
C)x-1=+11
x-1=+11
x-1+1=11+1
x=11+1
x-1=+11
x=11+1
x=12
Resposta
x=12
D)2x+8=14
2x+8=14
2x+8=14-8
2x=14-8
2x+8=14
2x=14-8
2x=6
2x÷2=6÷2
x=6÷2
2x÷2=6÷2
x=3
2x=6
x=3
Resposta
x=3
E)-9=6+5x.
-9=6+5x
-9-5x=6+5x-5x
-9-5x=6
-9=6+5x
-9-5x=6
-9=6+5x
-9-5x+9=6+9
-5x=6+9
-9=6+5x
-5x=6+9
-5x=15
-5÷(-5)=15÷(-5)
x=15÷(-5)
-5x÷(-5)15÷(-5)
x=-15÷5
-5x÷(-5)=15÷(-5)
x=-3
-5x=15
x=-3
Resposta
x=-3
F)+7=-14-x
7=-14-x
7+x=-14-x+x
7+x=-14
7=-14-x
7+x-7=-14
7+x=-14-x
7+x-7=-14-7
x=--14-7
7=-14-x
x=-14-7
-14-7
-(14+7)
-21
x=-14-7
x=-21
Resposta
x=21
G)5x+5=-10
5x+5=-10
5x+5-5=-10-5
5x=-10-5
5x+5=-10
5x=-10-5
-10-5
-(10+5)
-15
5x=-10-5
5x=-15
5x÷=-15÷5
x=-15÷5
5x÷5=-15÷5
x=-3
5x=-15
x=-3
Resposta
x=-3
H)-3x+15=-45
-3x+15=-45
-3x+15-15=-45-15
-3x=-45-15
-3x+15=-45
-3x=-45-15
-45-15
-(45+15)
-60
-3x=-45-15
-3x=-60
3x÷(-3)=-60+(-3)
x=-60÷(-3)
-3x÷(-3)=-60÷(-3)
x=60÷3
-3x÷(-3)=-60÷(-3)
x=20
-3x=-60
x=20
Resposta da
x=20